The Tiffen 86mm UV 17 Filter is a general use, clear filter that helps to absorb ultraviolet light and reduce the bluish cast of daylight. This filter is especially useful when photographing at high altitudes or around bodies of water. No additional coloration or contrast is provided, allowing you to pair this filter with others. This filter attenuates approximately 97% of UV radiation, slightly less than a UV 2A filter.

The UV filter is also useful as a general protective filter to leave on lenses at all times. Filters help to reduce dust and moisture from reaching your lens element and provide additional protection in case of drops or situations where scratching could occur.

Tiffen filters are made using ColorCore technology; a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding flat to a tolerance of 1/10,000th of an inch, then mounting to precision metal rings.

Absorbs 97% of Ultraviolet Light    Reduces Bluish Cast of Daylight    General Protective Filter    ColorCore Technology

Absorbs 97% of UV light and reduces bluish cast of daylight.

Clear filter provides no additional coloration or contrast, allowing you to pair this filter with others.

General protection filter reduces dust, moisture, and scratches from reaching lens elements.

Related Questions and Answers

Q: 1. does is work with a 20D?

A: Yes, it does. I use it with my 40, but it also works with the 20.

Q: 2. Hi there, will this lens work with a EOS-1 DS Mark II? Thanks!

A: Probably not. Full frame or neatly full frame digital SLRs froom Canon can not mount EF-S lenses since the latter's image circle will not cover a 24x36mm sensor.

Q: 3. does focus changes alot when you zooming?

A: The EF 17-40mm f/4L USM is a parfocal lens.

Q: 4. Is this lens parfocal?

A: Yes, the 17-40 is considered a Parfocal lens. And note that Parfocal zooms in the Canon EF lens line-up are essentially limited to the fixed-aperture L-series category and front-focusing zoom lenses.

Q: 5. Does it clear / fit over the flash tube of an ad400pro?

A: No it will not

Q: 6. Can I use it on my 6d?

A: Yes

Q: 7. The lens efs 17-85 fits on canon 6D mark II

A: No it will not. EF-S lenses don't fit on Full Frame/EF bodies.

Q: 8. Will it work on a Canon EOS Rebel T6???

A: Jorge, it will work, but be aware because of the crop factor, it really won't give you the true results of a 17-40mm. That said, I have one that I use on full frame bodies, and it's a nice light lens with reasonable quality.

Q: 9. Does this lense work with T7i?

A: All EF-S lenses are compatible with the T7i.

Q: 10. Can I use this lens on my Canon SL1 camera ?

A: Yes